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Article describes the "Dead Zone" in the Gulf of Mexico and why algae blooms are bad for the environment.

"First there was the Drinkable Book that purifies water and now, this ordinary looking billboard that supposedly cleans 100,000 cubic meters or 3.5 million cubic feet of air, per day. To put it in perspective, that is the equivalent of the amount of purification provided by 1,200 mature trees." Click on blue vocab words to see definitions.